用c++代码在Windows桌面应用程序中以各种字体格式输出文本：字体样式、字体大小等。

以下是一个例子，演示如何在 Windows 桌面应用程序中以不同的字体格式输出文本。这个例子使用了 Win32 API 来实现。

#include <Windows.h>

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    const char szClassName[] = "MyWindowClass";

    WNDCLASSEX wc;
    HWND hWnd;
    MSG msg;

    // Register the window class
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = szClassName;
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    if (!RegisterClassEx(&wc))
    {
        MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    // Create the window
    hWnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        szClassName,
        "My Window",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
        NULL, NULL, hInstance, NULL);

    if (hWnd == NULL)
    {
        MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    // Show the window
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    // Run the message loop
    while (GetMessage(&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
            HFONT hFont;
            LOGFONT lf;

            // Set up the font
            lf.lfHeight = 24;
            lf.lfWidth = 0;
            lf.lfEscapement = 0;
            lf.lfOrientation = 0;
            lf.lfWeight = FW_NORMAL;
            lf.lfItalic = TRUE;
            lf.lfUnderline = FALSE;
            lf.lfStrikeOut = FALSE;
            lf.lfCharSet = DEFAULT_CHARSET;
            lf.lfOutPrecision = OUT_DEFAULT_PRECIS;
            lf.lfClipPrecision = CLIP_DEFAULT_PRECIS;
            lf.lfQuality = DEFAULT_QUALITY;
            lf.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;
            strcpy_s(lf.lfFaceName, "Courier New");

            // Create the font
            hFont = CreateFontIndirect(&lf);

            // Select the font into the device context
            HFONT hOldFont = (HFONT)SelectObject(hdc, hFont);

            // Draw some text with the font
            TextOut(hdc, 10, 10, "Hello, World!", 13);

            // Change the font size
            lf.lfHeight = 36;
            DeleteObject(hFont);
            hFont = CreateFontIndirect(&lf);
            SelectObject(hdc, hFont);
            TextOut(hdc, 10, 50, "Hello, World!", 13);

            // Clean up
            SelectObject(hdc, hOldFont);
            DeleteObject(hFont);
            EndPaint(hWnd, &ps);
        }
        return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

    default:
        return DefWindowProc(hWnd, msg, wParam, lParam);
    }
}

这个例子创建了一个窗口，并使用了 `CreateFontIndirect` 函数创建了一个字体。字体的样式和大小都可以通过修改 LOGFONT 结构体的成员来设置。在 WM_PAINT 消息中，使用 `SelectObject` 函数将字体选入设备上下文，使用 `TextOut` 函数在窗口中绘制了一些文本。这个例子只是演示了如何在 Windows 桌面应用程序中输出文本，你可以根据自己的需求修改字体和文本内容。